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How is the specificity of a screening test calculated?

lizardasuje

wrote...

Posts: 762

Rep:

6 years ago

How is the specificity of a screening test calculated?

How is the specificity of a screening test calculated?

A) True positives/Total diseased
B) True negatives/Total not diseased
C) False negatives/Total diseased or 1 Sensitivity
D) False positives/Total not diseased or 1 Specificity

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elizabethxo1

wrote...

#1

6 years ago

Ans: B
Specificity (true-negative rate) is calculated as True negatives/Total not diseased. Sensitivity (true-positive rate) is calculated as True positives/Total diseased. False-negative rate is calculated as False negatives/Total diseased or 1 Sensitivity. False-positive rate is calculated as False positives/Total not diseased or 1 Specificity.

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